Brother BAS-304A User manual

.·

..._

...

----....-···

SERVICE MANUAL

{ELECTRICAL)

FOR

BAS-300A

SERIES

BAS-304A•311A•314A•315A

·---

326A•326LA•341A•342A

,·..

From the library of: Superior Sewing Machine & Supply LLC

This service

manual

has

been compiled so

that

can

bemadeintoa book sinceelectrical descriptions

for

the

BAS-300Aseries

are

verysimilar.

Applicable models

are

BAS-304A, 311A, 314A,

315A,326A, 326LA,341A,

and

342A.

For some of them,

the

electrical description

separated

for

the

air

and

solenoidspecifications.

From the library of: Superior Sewing Machine & Supply LLC

(ELECTRICAL

CHECKAND

DIP

SWITCH)

Warning

Nevertouchthree large-sized capacitors onthe powercircuit

board

(see

the illustration below).

The

high-

voltageresidual chargesstay

for

a minimum

1-2

minutesafterthepoweristurnedoff.

Cautions

* Duringchecking

repair

work

whenthepower

applied,take

care

not

short-circuitterminals.

* Check ifthecooling

fan

the

control boxworkscorrectly.

stops.

electronic partsand

devices

maybe

damaged due

high temperature inside

the

control box. To prevent

the

airvents from being choked

with

dust,clean them

regular intervals.

II1

Fuses

Fuse4

Fuse3

Fuse2

-+-Bh

Fuse1

NOTE:

When replactng

the

fuses,

sure

use

the

specified

ones

listed below.

No. Partname Partcode Manufacturer Problem

1 Fuse2A

152566-000

Fuji

Tansi

Company

The

work

clamp does

not

(Glasstube

fuse,

2A-125V)

FUJI

2A operate.

Fuse

152565-000

Fuji

Tansi

Company

Thepowerlamp does

not

come

(Glasstube

fuse,

SA·12SV)

FUJI

and

nooperation

occurs.

Fuse

15A

502887·000

Fuji

Tansi

Company

The

feed plate

and

presser

(Glass

tube

fuse,

15A-125V)

FUJI

15A

plate

notoperate.

GfuseSAFB

508030-000

Toyo

Fuse

Company

The

machine

motor

does

not

(Quick melting

type,

SA-2SOV)

TOYOSA

tum.

NOTE:

Prior

replacing fuse

No.4.

sure

check

the

array

assembly.

Measure

the

resistance

between

the

and e

terminals.

-1-

-If 20 -

Replace

fuse

The

array

assembly

workscorrectly.

(by

oon

range)

0 Q or

co:

Replace

the

array

assembly

andthe

pulse

motordrive

(PMD)

PCB,

instead

fuse

From the library of: Superior Sewing Machine & Supply LLC

rzl

Voltage measurement

1. Checkng

the

control

voltage

ru·m

power

while

connecting

the

connector

the

control

PCB,

then

measure

the

voltages

between

pins1 and 2, 3

and

4,and

between

5and 6

connectorP1.

Check

pointsof

the

control

PCB

Acceptable value

Between

pins

and

2 Approx.

Vdc

Between

pins

and

4 Approx.

Vdc

Between

pins

5and6 Approx.

Vdc

2. Checkng

the

source

Turn

power

while

connecting

the

connector

the

control

PCB,

then

measure

the

voltage between

pins 1and 2

connectorP7.

Checkng solenoids' voltages

Check

points

the

control

PCB

Between

pins

1and 2

Acceptablevalue

Approx.

Vdc

(1) Turn

off

the

power.

Remove

from

J1,

and

measure each solenoid's

resistance.

Resistance values are different according

the

sewingmachinemodel.

Check

points Solenoid Value 304A 326A 341A

311A 326LA 342A

Between Intermittent

Resistance

12n

pins1

and2

presserfoot Voltage

12V

20V

_/"

Proslerfoot(Oftly

Resistance

./'

forsolennl

./'

Between tpedfb11oct) Voltage 10V

pins3and4

Tension

Resistance

:;?'

_/"

release

Voltage

20V

Between

Thread

Resistance

100

pins5and6

trimmer Voftege

30V

20V

60V

Between Thread

Resistance

110

pins7and8 wiper Voltage 30V

20V

30V

)&(

Resistanceandvoltagevalues

are

approximate.

(2) lnsertP1

intoJ1,andturnonthe

power.

·2-

Insert

the

test

probe

from

the

lead

wire

side,

and

measurethevoltage.

•

for

the

presser foot and intermittent presser

foot

solenoids, measure

the

voltage

while

raising

and

lowering

them.

·As

for

tension

release,

thread

trimmer,

and

thread

wiper

solenoids,

start

sewing,

then

measure

the

voltageuponfinishing

sewing.

Since,

this

case,

the

indicator

only

oscillates

very

briefly,

the

value

used as a

rough

measure.

Each

voltagevalueis

the

above

table.

...

_.,.,.

From the library of: Superior Sewing Machine & Supply LLC

4. Checkng

air

valve's

voltage

NOTE:

When

the

machine

for

solenoid specification

the

BAS-304A

311A, there

need

connectthe

air

valves.

(J)

Presser

foot

(R) valve

Presser

foot

(L)valve

G Intermittentpresservalve

(only

for

BAS-341A

and

342A)

® Innerclampvalve

$ Optionvalve 1

8 Optionvalve2

(/) Optionvalve3

8 Needle coolervalve

+24V

NOTE:

@to

8 areoptions.

Turn

the

power

switch

OFF.

Disconnect connector

from

J8,

then measure

the

resistance

each

valve.

Resistance

each valve (from (t)

to$,

to~)

should be approx.3000.

Connect connector

J8,

then

turn

the

power

switch

ON.

Insert

the

test probes

into

connector

from the

lead

wire

side, then measure

the

voltages.

Check

points

Acceptable

value

Between pins 1

(-}and

10C

0.1V-24V

Between pins2

(-)and

10C

0.1V-24V

Between pins3

(-}and

10(

0.1V-24V

When

the

work

clamp

pedal is

treadled,

each

readingshould be max. 24VI min. 0.1V.

When

the

optionalvalve

used:

-3-

Measure

the

resistance between each valve and

®. (Refer

step1.)

Measure

the

resistance between

each

valve

(-)

and ® (

when

each valve operates. (Refer

step2.)

From the library of: Superior Sewing Machine & Supply LLC

Ill Control box

fi~---~

"----

•.

_____

Solenoid connector

Synchronizerconnector

Connectorfor emergencystop, zero-point

sygnal

and

thread

breakage

detection

J4 X-drive pulse

motor

connector

Y-drive pulse

motor

connector

Footswitchconnector

Programmingdeviceconnector

Air

valveconnector

J9 Machinelightconnector(6VAC. 2A)

J10 :

Marker

light

connector

(SV

AC,

3A)

r---.,

lra:QJI

: 1

s1o

~Kmlr

'"---.J

lool

From the library of: Superior Sewing Machine & Supply LLC

Ill

Explanation

connectors

the

machine

has

been disassembled

adjusted during repairwork, most

the

machine

troubles

are

due

connector problems including improperconnection

weakcontact.

is,

therefore,

necessary

check

each connector numberand pin contact

for

correct connection prior

proceeding

thetroubleshooting

procedures.

The

table

below

lists

the

connectornumbersand symptoms resulting

from

wrong

connections. For detailed

connectorand harnessarrangement, refer

•coNTROL

CIRCUIT

BLOCK

DIAGRAM•.

Connector No. and location

Main

PCB

I P8 I

I P3 I

PMDPCB

I .MainPCB I

I I

m [5[5

ElBg

I J11 I

Solenoid

Air

valve

~In~

nlsve.

motor

Motor

Main

PCB

-[ L

·I

P13

:~M+r:

I I I 1 I

PMD

I I

Main

PCB

I P14 I

I P2 I

Synchronizer

Drivesignalsand source

Control

power

source

Solenoiddrivepower

source

Pulse

motor

drive

power

source

Symptoms resulting from wrong connection

• Abnormal motion

•

Nomotion

• OnlyPan

motor

operates

• Faulty

operation

the

presser

plate,

presser

foot,

thread

wiper

components,

main

presser,

thread

trimming ,

thread

releasecomponents

• Stepout

Xand Y

axes

• Unusual noises

X-drive

andY-drive

pulse

motors

Start/stopcontrol currents

for

• Abnormal rotationspeed

the

pulley

the

machine

+SV

Needlestopposition control,

synchronizationcontrol,and

rotationcontrol signals

• Stopoperationfailure

• The pulley

does

not

rotate

• The

machine

sews

abnormally

high

speed,

then

stops. (The EMERGENCY

stop

lamp

lights.)

• The machine does

not

stop with

the

needle

the

upperposition.

• The pulley rotates,

but

the

feed mechanism

does

not

work

From the library of: Superior Sewing Machine & Supply LLC

ConnectorNo. and

location

Main

PCB

[PO

f I

l J

1control

panel

PCBJ

Main

PCB

em]

·I Programmer

MainPCB

IIP31

Floppy

disk

Main

PCB

Qifl

,,2

T T

Xh I . . h I

ome

position Y

ome

positiOn

PCB

Main

PCB

QCJ

Drive

signals and

source

+SV

Speed control signal

Key andswitch signals

Indicatorcontrol

sig~ls

Read

and

write

signals

from/to

floppy

disks

andY

home

position

signals

switchsignal

LED

signal

Drivesignal

Presser

plate

lifting

signal

Symptoms resultingfrom

wrong

connection

• The

POWER

lamp

does

not

comeon.

•

Although

the

speed <ontrol dial is

turned,

the machine does riot change the

rotation

speed and keeps

2000

spm.

•

Malfunction

programming

device

•

The

floppy

diskdata

cannot

read.

(ErrorNo.4)

• Themachine

cannot

detect

home

position.

• The emergency

stop

function

cannot

activated.

• The

EMERGENCY

stop

lamp

lights

and

its

function

cannot

becanceled.

• The machine

neither

starts

operation

nor

lifts

the

presser

plate

the

corresponding

foot

switch is depressed.

From the library of: Superior Sewing Machine & Supply LLC

liJ

Dip switch settings

NOTE:

sure

turn

off

the

power

before

changing

the

DIP

switch

settings.

ct::::J.

No.

When

1 Workclamp

does

not

rise whensewing

com

plated

2 Rfght..,.lefttwo-stepworkclamp(When

No.4

ON)

Left~

righttwo-stepworkclamp(WhenNo.

41s

ON)

Fer

the

BAS-304A

311A

with solenoid spedfication,

4 Whenthe

switches

2,3and4 areon. left

and

rightwork

clamps

will

descend

set®

No.2~

and 4

OFF.

onetimerand presserfoot

will

descend

With

two

positions.

5 Workclampdoes

not

rise

during

split

mode

operation.

Presser

crank

Innerclamping

device

turns

theother

side

(Innerdamping

device

optional.)

7 Single pedaloperation

possible

using

thest.rtingpedal

8 Activatesthread breakagedetector

(Thread

breakagedetector

optional.)

No. WhenON

1 Singlesplit

mode

possible

2 8000-stitch sewing mode

possible

3 Threadtrimming

does

notfunctionwhen

emergency

stopswitd1

pressed.

4 Needlecooler

can

used.(Needlecooler

device

optional.)

5 Thread breakagedetectionstitch marginsetting

can

set

either8

stitches.

6 Ad:ivatesfiberthread breakagedetector(optional part)

7 Tripletpedal operation

possible

{Triplet

pedal

optional.}

High

feed

speed

No. When

, Thefirsttwostitchesare

sewn

low

speed

(approx.

260

spm).

Thelalttwo

stitchesare

sewn

low

speed

(approx.

260

spm).

The

upparshaftturns

the

reverse

directionafterttveadbreakage, andthe

machine

stops

with

the

needle

its highestposition.

4 Does

not

output

error

No.2even

synchronizer

notconnocted

-7-

From the library of: Superior Sewing Machine & Supply LLC

The

setting

the

DIP

switch@ in

the

control boxdetermines

the

machine model.

thesetting

not

correct

for

the

machinehead,

may

cause

damage

a printedcircuit board.

0-1

304A

OFF

311A

326A

OFF

326LA ON

341A

OFF

342A ON

No.

D-2

OFF

D-3

OFF

No.2

No.1,

3,4

OFF

D-4

OFF

No.1,20N

No.3,40FF

(

ERROR

NO.

LIST)

Cause

Emergency

stopswitch

pressed

Trouble

with

themotor

synchronizerI

Motor

stopped whenvoltagedropped

Over-area

Floppydisk

not

inserted,

cable

not

properlyconnected

Floppydisk

locked (writeprotected)

Noprogramregistered

Erroroccurred

program

mode

Thread breakagedetected

Protection networkactivated

because

abnormal voltage

usable pattemdataon

di'k

From the library of: Superior Sewing Machine & Supply LLC

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